Thermoregulation:The Cold Hard Facts of Freezin......

The Science of Running a Marathon...

This is your brain on exercise | Neuroscientist......

Unlocking the Chemistry of Exercise...

Using molecular classification to predict gains......

Where Do Muscles Get Their Power? Fifty-Year-Ol......

Your Body During a 100-Miler | Outside Online...

Your Body on Brain Doping | The Fit List | Outs......

Cardiorespiratory: When Exercise Is Too Much of a Good Thing - NYTimes.com

Jonathan Knowles/Getty Images Recently, researchers in Britain set out to study the heart health of a group of dauntingly fit older athletes. Uninterested in sluggards, the scientists recruited only men who had been part of a British national or Olympic team in distance running or rowing, as well as members of the extremely selective 100 Marathon club, which admits runners who, as you might have guessed, have completed at least a hundred marathons.